Map: Premature birth rates

The rate of preterm births in the United States has been dropping in recent years, and is at the lowest in a decade, at 11.7%, as of 2011. But there are still disparities among the states. Mississippi, which has the highest rate, also has the country's biggest infant mortality and obesity problems.

March of Dimes grades for preterm birth rates

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B

C

D

F

Click a state for more information.

Sources: March of Dimes, National Center for Health Statistics, Centers for Disease Control and Prevention